Abbreviation, Acronym, and Initialism
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
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An abbreviation shortens a word; an initialism is spoken letter by letter; an acronym is spoken as a word.
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CT is an initialism. CABG, spoken as cabbage, is an acronym.
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All three are shortcuts, and all three lose information the full form carried.